用激光-V棱镜装置测得耐热型硅树脂在632.8nm和650nm波长上的热光系数分别为-3.3×10-4/℃和-3.6×10-4/℃。以石英玻璃为衬底,用该材料制作了平板波导,用棱镜耦合法测量了不同温度下波导的有效折射率,利用平板波导模式本征方程求解出不同温度下导波层的膜厚与折射率,分析了有效折射率随温度变化的特点。根据导波层折射率与厚度的变化和高分子材料的克劳修斯莫索提公式,分析出该材料的极性分子较大,是引起负热光系数大的原因。该材料适合用于研制低功耗、与塑料光纤匹配的短距离光通信热光开关。 The thermo-optic coefficients of the heat-resistant silicone measured at 632.8 nm and 650 nm with the laser-V prism device were -3.3 × 10 -4 / ° C. and -3.6 × 10 -4 / ° C., respectively. Using quartz glass as the substrate, a slab waveguide was fabricated by using this material. The effective refractive index of the waveguide at different temperatures was measured by the prism coupling method. The intrinsic wave equation of slab waveguide was used to calculate the film thickness and refraction Rate, analysis of the effective refractive index with temperature characteristics. According to the change of the refractive index and the thickness of the waveguide and the Clausius Mozart equation of the polymer material, it is analyzed that the material has a large number of polar molecules and is the cause of the large negative thermal coefficient of light. The material is suitable for the development of low-power, plastic optical fiber matching short-range optical communications thermal switch.